focal (3) Config::Model::models::Sshd::MatchElement.3pm.gz

Provided by: libconfig-model-openssh-perl_2.8.0.1-1_all bug

NAME

       Config::Model::models::Sshd::MatchElement - Configuration class Sshd::MatchElement

DESCRIPTION

       Configuration classes used by Config::Model

       This configuration class was generated from sshd_system documentation.  by parse-man.pl
       <https://github.com/dod38fr/config-model-openssh/contrib/parse-man.pl>

Elements

   AcceptEnv
       Specifies what environment variables sent by the client will be copied into the session's environ(7). See
       SendEnv and SetEnv in ssh_config(5) for how to configure the client. The TERM environment variable is
       always accepted whenever the client requests a pseudo-terminal as it is required by the protocol.
       Variables are specified by name, which may contain the wildcard characters '*' and '?'. Multiple
       environment variables may be separated by whitespace or spread across multiple AcceptEnv directives. Be
       warned that some environment variables could be used to bypass restricted user environments. For this
       reason, care should be taken in the use of this directive. The default is not to accept any environment
       variables.  Optional. Type list of uniline.

   AllowAgentForwarding
       Specifies whether ssh-agent(1) forwarding is permitted. The default is yes. Note that disabling agent
       forwarding does not improve security unless users are also denied shell access, as they can always
       install their own forwarders.  Optional. Type boolean.

       upstream_default value :
           yes

   AllowGroups
       This keyword can be followed by a list of group name patterns, separated by spaces. If specified, login
       is allowed only for users whose primary group or supplementary group list matches one of the patterns.
       Only group names are valid; a numerical group ID is not recognized. By default, login is allowed for all
       groups. The allow/deny directives are processed in the following order: DenyUsers, AllowUsers,
       DenyGroups, and finally AllowGroups.

       See PATTERNS in ssh_config(5) for more information on patterns.  Optional. Type list of uniline.

   AllowStreamLocalForwarding
       Specifies whether StreamLocal (Unix-domain socket) forwarding is permitted. The available options are yes
       (the default) or all to allow StreamLocal forwarding, no to prevent all StreamLocal forwarding, local to
       allow local (from the perspective of ssh(1)) forwarding only or remote to allow remote forwarding only.
       Note that disabling StreamLocal forwarding does not improve security unless users are also denied shell
       access, as they can always install their own forwarders.  Optional. Type enum. choice: 'yes', 'all',
       'no', 'local', 'remote'.

       upstream_default value :
           yes

   AllowTcpForwarding
       Specifies whether TCP forwarding is permitted. The available options are yes (the default) or all to
       allow TCP forwarding, no to prevent all TCP forwarding, local to allow local (from the perspective of
       ssh(1)) forwarding only or remote to allow remote forwarding only. Note that disabling TCP forwarding
       does not improve security unless users are also denied shell access, as they can always install their own
       forwarders.  Optional. Type enum. choice: 'yes', 'all', 'no', 'local', 'remote'.

       upstream_default value :
           yes

   AllowUsers
       This keyword can be followed by a list of user name patterns, separated by spaces. If specified, login is
       allowed only for user names that match one of the patterns. Only user names are valid; a numerical user
       ID is not recognized. By default, login is allowed for all users. If the pattern takes the form USER@HOST
       then USER and HOST are separately checked, restricting logins to particular users from particular hosts.
       HOST criteria may additionally contain addresses to match in CIDR address/masklen format. The allow/deny
       directives are processed in the following order: DenyUsers, AllowUsers, DenyGroups, and finally
       AllowGroups.

       See PATTERNS in ssh_config(5) for more information on patterns.  Optional. Type list of uniline.

   AuthenticationMethods
       Specifies the authentication methods that must be successfully completed for a user to be granted access.
       This option must be followed by one or more lists of comma-separated authentication method names, or by
       the single string any to indicate the default behaviour of accepting any single authentication method. If
       the default is overridden, then successful authentication requires completion of every method in at least
       one of these lists.

       For example, "publickey,password publickey,keyboard-interactive" would require the user to complete
       public key authentication, followed by either password or keyboard interactive authentication. Only
       methods that are next in one or more lists are offered at each stage, so for this example it would not be
       possible to attempt password or keyboard-interactive authentication before public key.

       For keyboard interactive authentication it is also possible to restrict authentication to a specific
       device by appending a colon followed by the device identifier bsdauth or pam. depending on the server
       configuration. For example, "keyboard-interactive:bsdauth" would restrict keyboard interactive
       authentication to the bsdauth device.

       If the publickey method is listed more than once, sshd(8) verifies that keys that have been used
       successfully are not reused for subsequent authentications. For example, "publickey,publickey" requires
       successful authentication using two different public keys.

       Note that each authentication method listed should also be explicitly enabled in the configuration.

       The available authentication methods are: "gssapi-with-mic", "hostbased", "keyboard-interactive", "none"
       (used for access to password-less accounts when PermitEmptyPasswords is enabled), "password" and
       "publickey".  Optional. Type uniline.

   AuthorizedKeysCommand
       Specifies a program to be used to look up the user's public keys. The program must be owned by root, not
       writable by group or others and specified by an absolute path. Arguments to AuthorizedKeysCommand accept
       the tokens described in the TOKENS section. If no arguments are specified then the username of the target
       user is used.

       The program should produce on standard output zero or more lines of authorized_keys output (see
       AUTHORIZED_KEYS in sshd(8)). If a key supplied by AuthorizedKeysCommand does not successfully
       authenticate and authorize the user then public key authentication continues using the usual
       AuthorizedKeysFile files. By default, no AuthorizedKeysCommand is run.  Optional. Type uniline.

   AuthorizedKeysCommandUser
       Specifies the user under whose account the AuthorizedKeysCommand is run. It is recommended to use a
       dedicated user that has no other role on the host than running authorized keys commands. If
       AuthorizedKeysCommand is specified but AuthorizedKeysCommandUser is not, then sshd(8) will refuse to
       start.  Optional. Type uniline.

   AuthorizedKeysFile
       Specifies the file that contains the public keys used for user authentication. The format is described in
       the AUTHORIZED_KEYS FILE FORMAT section of sshd(8). Arguments to AuthorizedKeysFile accept the tokens
       described in the TOKENS section. After expansion, AuthorizedKeysFile is taken to be an absolute path or
       one relative to the user's home directory. Multiple files may be listed, separated by whitespace.
       Alternately this option may be set to none to skip checking for user keys in files. The default is
       ".ssh/authorized_keys .ssh/authorized_keys2".  Optional. Type list of uniline.

       Note: AuthorizedKeysFile values are migrated from '- AuthorizedKeysFile2'

   AuthorizedPrincipalsCommand
       Specifies a program to be used to generate the list of allowed certificate principals as per
       AuthorizedPrincipalsFile. The program must be owned by root, not writable by group or others and
       specified by an absolute path. Arguments to AuthorizedPrincipalsCommand accept the tokens described in
       the TOKENS section. If no arguments are specified then the username of the target user is used.

       The program should produce on standard output zero or more lines of AuthorizedPrincipalsFile output. If
       either AuthorizedPrincipalsCommand or AuthorizedPrincipalsFile is specified, then certificates offered by
       the client for authentication must contain a principal that is listed. By default, no
       AuthorizedPrincipalsCommand is run.  Optional. Type uniline.

   AuthorizedPrincipalsCommandUser
       Specifies the user under whose account the AuthorizedPrincipalsCommand is run. It is recommended to use a
       dedicated user that has no other role on the host than running authorized principals commands. If
       AuthorizedPrincipalsCommand is specified but AuthorizedPrincipalsCommandUser is not, then sshd(8) will
       refuse to start.  Optional. Type uniline.

   AuthorizedPrincipalsFile
       Specifies a file that lists principal names that are accepted for certificate authentication. When using
       certificates signed by a key listed in TrustedUserCAKeys, this file lists names, one of which must appear
       in the certificate for it to be accepted for authentication. Names are listed one per line preceded by
       key options (as described in AUTHORIZED_KEYS FILE FORMAT in sshd(8)). Empty lines and comments starting
       with '#' are ignored.

       Arguments to AuthorizedPrincipalsFile accept the tokens described in the TOKENS section. After expansion,
       AuthorizedPrincipalsFile is taken to be an absolute path or one relative to the user's home directory.
       The default is none, i.e. not to use a principals file X in this case, the username of the user must
       appear in a certificate's principals list for it to be accepted.

       Note that AuthorizedPrincipalsFile is only used when authentication proceeds using a CA listed in
       TrustedUserCAKeys and is not consulted for certification authorities trusted via ~/.ssh/authorized_keys,
       though the principals= key option offers a similar facility (see sshd(8) for details).  Optional. Type
       uniline.

       upstream_default value :
           none

   Banner
       The contents of the specified file are sent to the remote user before authentication is allowed. If the
       argument is none then no banner is displayed. By default, no banner is displayed.  Optional. Type
       uniline.

   ChrootDirectory
       Specifies the pathname of a directory to chroot(2) to after authentication. At session startup sshd(8)
       checks that all components of the pathname are root-owned directories which are not writable by any other
       user or group. After the chroot, sshd(8) changes the working directory to the user's home directory.
       Arguments to ChrootDirectory accept the tokens described in the TOKENS section.

       The ChrootDirectory must contain the necessary files and directories to support the user's session. For
       an interactive session this requires at least a shell, typically sh(1), and basic /dev nodes such as
       null(4), zero(4), stdin(4), stdout(4), stderr(4), and tty(4) devices. For file transfer sessions using
       SFTP no additional configuration of the environment is necessary if the in-process sftp-server is used,
       though sessions which use logging may require /dev/log inside the chroot directory on some operating
       systems (see sftp-server(8) for details).

       For safety, it is very important that the directory hierarchy be prevented from modification by other
       processes on the system (especially those outside the jail). Misconfiguration can lead to unsafe
       environments which sshd(8) cannot detect.

       The default is none, indicating not to chroot(2).  Optional. Type uniline.

       upstream_default value :
           none

   ClientAliveCountMax
       Sets the number of client alive messages which may be sent without sshd(8) receiving any messages back
       from the client. If this threshold is reached while client alive messages are being sent, sshd will
       disconnect the client, terminating the session. It is important to note that the use of client alive
       messages is very different from TCPKeepAlive. The client alive messages are sent through the encrypted
       channel and therefore will not be spoofable. The TCP keepalive option enabled by TCPKeepAlive is
       spoofable. The client alive mechanism is valuable when the client or server depend on knowing when a
       connection has become inactive.

       The default value is 3. If ClientAliveInterval is set to 15, and ClientAliveCountMax is left at the
       default, unresponsive SSH clients will be disconnected after approximately 45 seconds.  Optional. Type
       integer.

       upstream_default value :
           3

   ClientAliveInterval
       Sets a timeout interval in seconds after which if no data has been received from the client, sshd(8) will
       send a message through the encrypted channel to request a response from the client. The default is 0,
       indicating that these messages will not be sent to the client.  Optional. Type integer.

       upstream_default value :
           0

   DenyGroups
       This keyword can be followed by a list of group name patterns, separated by spaces. Login is disallowed
       for users whose primary group or supplementary group list matches one of the patterns. Only group names
       are valid; a numerical group ID is not recognized. By default, login is allowed for all groups. The
       allow/deny directives are processed in the following order: DenyUsers, AllowUsers, DenyGroups, and
       finally AllowGroups.

       See PATTERNS in ssh_config(5) for more information on patterns.  Optional. Type list of uniline.

   DenyUsers
       This keyword can be followed by a list of user name patterns, separated by spaces. Login is disallowed
       for user names that match one of the patterns.  Only user names are valid; a numerical user ID is not
       recognized. By default, login is allowed for all users. If the pattern takes the form USER@HOST then USER
       and HOST are separately checked, restricting logins to particular users from particular hosts. HOST
       criteria may additionally contain addresses to match in CIDR address/masklen format.  The allow/deny
       directives are processed in the following order: DenyUsers, AllowUsers, DenyGroups, and finally
       AllowGroups.

       See PATTERNS in ssh_config(5) for more information on patterns.  Optional. Type list of uniline.

   ForceCommand
       Forces the execution of the command specified by ForceCommand, ignoring any command supplied by the
       client and ~/.ssh/rc if present. The command is invoked by using the user's login shell with the -c
       option. This applies to shell, command, or subsystem execution. It is most useful inside a Match block.
       The command originally supplied by the client is available in the SSH_ORIGINAL_COMMAND environment
       variable. Specifying a command of internal-sftp will force the use of an in-process SFTP server that
       requires no support files when used with ChrootDirectory. The default is none.  Optional. Type uniline.

       upstream_default value :
           none

   GatewayPorts
       Specifies whether remote hosts are allowed to connect to ports forwarded for the client. By default,
       sshd(8) binds remote port forwardings to the loopback address. This prevents other remote hosts from
       connecting to forwarded ports. GatewayPorts can be used to specify that sshd should allow remote port
       forwardings to bind to non-loopback addresses, thus allowing other hosts to connect. The argument may be
       no to force remote port forwardings to be available to the local host only, yes to force remote port
       forwardings to bind to the wildcard address, or clientspecified to allow the client to select the address
       to which the forwarding is bound. The default is no.  Optional. Type enum. choice: 'no', 'yes',
       'clientspecified'.

       upstream_default value :
           no

   GSSAPIAuthentication
       Specifies whether user authentication based on GSSAPI is allowed. The default is no.  Optional. Type
       boolean.

       upstream_default value :
           no

   HostbasedAcceptedKeyTypes
       Specifies the key types that will be accepted for hostbased authentication as a list of comma-separated
       patterns. Alternately if the specified value begins with a '+' character, then the specified key types
       will be appended to the default set instead of replacing them. If the specified value begins with a '-'
       character, then the specified key types (including wildcards) will be removed from the default set
       instead of replacing them. The default for this option is:

       ecdsa-sha2-nistp256-cert-v01@openssh.com,

       ecdsa-sha2-nistp384-cert-v01@openssh.com, ecdsa-sha2-nistp521-cert-v01@openssh.com,
       ssh-ed25519-cert-v01@openssh.com,

       rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,

       ssh-rsa-cert-v01@openssh.com,

       ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,

       ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa

       The list of available key types may also be obtained using "ssh -Q key".  Optional. Type uniline.

   HostbasedAuthentication
       Specifies whether rhosts or /etc/hosts.equiv authentication together with successful public key client
       host authentication is allowed (host-based authentication). The default is no.  Optional. Type boolean.

       upstream_default value :
           no

   HostbasedUsesNameFromPacketOnly
       Specifies whether or not the server will attempt to perform a reverse name lookup when matching the name
       in the ~/.shosts, ~/.rhosts, and /etc/hosts.equiv files during HostbasedAuthentication. A setting of yes
       means that sshd(8) uses the name supplied by the client rather than attempting to resolve the name from
       the TCP connection itself. The default is no.  Optional. Type boolean.

       upstream_default value :
           no

   IPQoS
       Specifies the IPv4 type-of-service or DSCP class for the connection.  Accepted values are af11, af12,
       af13, af21, af22, af23, af31, af32, af33, af41, af42, af43, cs0, cs1, cs2, cs3, cs4, cs5, cs6, cs7, ef,
       lowdelay, throughput, reliability, a numeric value, or none to use the operating system default. This
       option may take one or two arguments, separated by whitespace. If one argument is specified, it is used
       as the packet class unconditionally. If two values are specified, the first is automatically selected for
       interactive sessions and the second for non-interactive sessions. The default is lowdelay for interactive
       sessions and throughput for non-interactive sessions.  Optional. Type uniline.

       upstream_default value :
           af21 cs1

   KbdInteractiveAuthentication
       Specifies whether to allow keyboard-interactive authentication. The argument to this keyword must be yes
       or no. The default is to use whatever value ChallengeResponseAuthentication is set to (by default yes).
       Optional. Type boolean.

   KerberosAuthentication
       Specifies whether the password provided by the user for PasswordAuthentication will be validated through
       the Kerberos KDC. To use this option, the server needs a Kerberos servtab which allows the verification
       of the KDC's identity. The default is no.  Optional. Type boolean.

       upstream_default value :
           no

   LogLevel
       Gives the verbosity level that is used when logging messages from sshd(8). The possible values are:
       QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2, and DEBUG3. The default is INFO. DEBUG and
       DEBUG1 are equivalent. DEBUG2 and DEBUG3 each specify higher levels of debugging output. Logging with a
       DEBUG level violates the privacy of users and is not recommended.  Optional. Type enum. choice: 'QUIET',
       'FATAL', 'ERROR', 'INFO', 'VERBOSE', 'DEBUG', 'DEBUG1', 'DEBUG2', 'DEBUG3'.

       upstream_default value :
           INFO

   MaxAuthTries
       Specifies the maximum number of authentication attempts permitted per connection. Once the number of
       failures reaches half this value, additional failures are logged. The default is 6.  Optional. Type
       integer.

       upstream_default value :
           6

   MaxSessions
       Specifies the maximum number of open shell, login or subsystem (e.g. sftp) sessions permitted per network
       connection. Multiple sessions may be established by clients that support connection multiplexing.
       Setting MaxSessions to 1 will effectively disable session multiplexing, whereas setting it to 0 will
       prevent all shell, login and subsystem sessions while still permitting forwarding. The default is 10.
       Optional. Type integer.

       upstream_default value :
           10

   PasswordAuthentication
       Specifies whether password authentication is allowed. The default is yes.  Optional. Type boolean.

       upstream_default value :
           yes

   PermitEmptyPasswords
       When password authentication is allowed, it specifies whether the server allows login to accounts with
       empty password strings. The default is no.  Optional. Type boolean.

       upstream_default value :
           no

   PermitListen
       Specifies the addresses/ports on which a remote TCP port forwarding may listen. The listen specification
       must be one of the following forms:

       PermitListenport PermitListen host:port

       Multiple permissions may be specified by separating them with whitespace. An argument of any can be used
       to remove all restrictions and permit any listen requests. An argument of none can be used to prohibit
       all listen requests.  The host name may contain wildcards as described in the PATTERNS section in
       ssh_config(5). The wildcard '*' can also be used in place of a port number to allow all ports. By default
       all port forwarding listen requests are permitted. Note that the GatewayPorts option may further restrict
       which addresses may be listened on. Note also that ssh(1) will request a listen host of localhost if no
       listen host was specifically requested, and this name is treated differently to explicit localhost
       addresses of X127.0.0.1X and X::1X.  Optional. Type list of uniline.

   PermitOpen
       Specifies the destinations to which TCP port forwarding is permitted. The forwarding specification must
       be one of the following forms:

       PermitOpenhost:port PermitOpen IPv4_addr:port PermitOpen [IPv6_addr]:port

       Multiple forwards may be specified by separating them with whitespace. An argument of any can be used to
       remove all restrictions and permit any forwarding requests. An argument of none can be used to prohibit
       all forwarding requests. The wildcard '*' can be used for host or port to allow all hosts or ports,
       respectively. By default all port forwarding requests are permitted.  Optional. Type list of uniline.

   PermitRootLogin
       Specifies whether root can log in using ssh(1). The argument must be yes, prohibit-password, forced-
       commands-only, or no. The default is prohibit-password.

       If this option is set to prohibit-password (or its deprecated alias, without-password), password and
       keyboard-interactive authentication are disabled for root.

       If this option is set to forced-commands-only, root login with public key authentication will be allowed,
       but only if the command option has been specified (which may be useful for taking remote backups even if
       root login is normally not allowed). All other authentication methods are disabled for root.

       If this option is set to no, root is not allowed to log in.  Optional. Type enum. choice: 'yes',
       'prohibit-password', 'forced-commands-only', 'no'.

   PermitTTY
       Specifies whether pty(4) allocation is permitted. The default is yes.  Optional. Type boolean.

       upstream_default value :
           yes

   PermitTunnel
       Specifies whether tun(4) device forwarding is allowed. The argument must be yes, point-to-point (layer
       3), ethernet (layer 2), or no. Specifying yes permits both point-to-point and ethernet. The default is
       no.

       Independent of this setting, the permissions of the selected tun(4) device must allow access to the user.
       Optional. Type enum. choice: 'yes', 'point-to-point', 'ethernet', 'no'.

       upstream_default value :
           no

   PermitUserRC
       Specifies whether any ~/.ssh/rc file is executed. The default is yes.  Optional. Type boolean.

       upstream_default value :
           yes

   PubkeyAcceptedKeyTypes
       Specifies the key types that will be accepted for public key authentication as a list of comma-separated
       patterns. Alternately if the specified value begins with a '+' character, then the specified key types
       will be appended to the default set instead of replacing them. If the specified value begins with a '-'
       character, then the specified key types (including wildcards) will be removed from the default set
       instead of replacing them. The default for this option is:

       ecdsa-sha2-nistp256-cert-v01@openssh.com,

       ecdsa-sha2-nistp384-cert-v01@openssh.com, ecdsa-sha2-nistp521-cert-v01@openssh.com,
       ssh-ed25519-cert-v01@openssh.com,

       rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,

       ssh-rsa-cert-v01@openssh.com,

       ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,

       ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa

       The list of available key types may also be obtained using "ssh -Q key".  Optional. Type uniline.

   PubkeyAuthentication
       Specifies whether public key authentication is allowed. The default is yes.  Optional. Type boolean.

       upstream_default value :
           yes

   RekeyLimit
       Specifies the maximum amount of data that may be transmitted before the session key is renegotiated,
       optionally followed a maximum amount of time that may pass before the session key is renegotiated. The
       first argument is specified in bytes and may have a suffix of 'K', 'M', or 'G' to indicate Kilobytes,
       Megabytes, or Gigabytes, respectively.  The default is between '1G' and '4G', depending on the cipher.
       The optional second value is specified in seconds and may use any of the units documented in the TIME
       FORMATS section. The default value for RekeyLimit is default none, which means that rekeying is performed
       after the cipher's default amount of data has been sent or received and no time based rekeying is done.
       Optional. Type uniline.

   RevokedKeys
       Specifies revoked public keys file, or none to not use one. Keys listed in this file will be refused for
       public key authentication. Note that if this file is not readable, then public key authentication will be
       refused for all users. Keys may be specified as a text file, listing one public key per line, or as an
       OpenSSH Key Revocation List (KRL) as generated by ssh-keygen(1). For more information on KRLs, see the
       KEY REVOCATION LISTS section in ssh-keygen(1).  Optional. Type uniline.

   RDomain
       Specifies an explicit routing domain that is applied after authentication has completed.  The user
       session, as well and any forwarded or listening IP sockets, will be bound to this rdomain(4). If the
       routing domain is set to %D, then the domain in which the incoming connection was received will be
       applied.  Optional. Type uniline.

   SetEnv
       Specifies one or more environment variables to set in child sessions started by sshd(8) as XNAME=VALUEX.
       The environment value may be quoted (e.g. if it contains whitespace characters). Environment variables
       set by SetEnv override the default environment and any variables specified by the user via AcceptEnv or
       PermitUserEnvironment.  Optional. Type uniline.

   StreamLocalBindMask
       Sets the octal file creation mode mask (umask) used when creating a Unix-domain socket file for local or
       remote port forwarding. This option is only used for port forwarding to a Unix-domain socket file.

       The default value is 0177, which creates a Unix-domain socket file that is readable and writable only by
       the owner. Note that not all operating systems honor the file mode on Unix-domain socket files.
       Optional. Type uniline.

   StreamLocalBindUnlink
       Specifies whether to remove an existing Unix-domain socket file for local or remote port forwarding
       before creating a new one. If the socket file already exists and StreamLocalBindUnlink is not enabled,
       sshd will be unable to forward the port to the Unix-domain socket file. This option is only used for port
       forwarding to a Unix-domain socket file.

       The argument must be yes or no. The default is no.  Optional. Type boolean.

       upstream_default value :
           no

   TrustedUserCAKeys
       Specifies a file containing public keys of certificate authorities that are trusted to sign user
       certificates for authentication, or none to not use one. Keys are listed one per line; empty lines and
       comments starting with '#' are allowed. If a certificate is presented for authentication and has its
       signing CA key listed in this file, then it may be used for authentication for any user listed in the
       certificate's principals list. Note that certificates that lack a list of principals will not be
       permitted for authentication using TrustedUserCAKeys. For more details on certificates, see the
       CERTIFICATES section in ssh-keygen(1).  Optional. Type uniline.

   X11DisplayOffset
       Specifies the first display number available for sshd(8)'s X11 forwarding. This prevents sshd from
       interfering with real X11 servers. The default is 10.  Optional. Type uniline.

   X11Forwarding
       Specifies whether X11 forwarding is permitted. The argument must be yes or no. The default is no.

       When X11 forwarding is enabled, there may be additional exposure to the server and to client displays if
       the sshd(8) proxy display is configured to listen on the wildcard address (see X11UseLocalhost), though
       this is not the default.  Additionally, the authentication spoofing and authentication data verification
       and substitution occur on the client side.  The security risk of using X11 forwarding is that the
       client's X11 display server may be exposed to attack when the SSH client requests forwarding (see the
       warnings for ForwardX11 in ssh_config(5)). A system administrator may have a stance in which they want to
       protect clients that may expose themselves to attack by unwittingly requesting X11 forwarding, which can
       warrant a no setting.

       Note that disabling X11 forwarding does not prevent users from forwarding X11 traffic, as users can
       always install their own forwarders.  Optional. Type boolean.

       upstream_default value :
           no

   AuthorizedKeysFile2
       This parameter is now ignored by Ssh. Deprecated  Optional. Type list of uniline.

   Protocol
       Deprecated  Optional. Type uniline.

   RSAAuthentication
       Deprecated  Optional. Type uniline.

   RhostsRSAAuthentication
       Deprecated  Optional. Type uniline.

   UsePrivilegeSeparation
       Deprecated  Optional. Type uniline.

   KeyRegenerationInterval
       Deprecated  Optional. Type uniline.

SEE ALSO

       •   cme

LICENSE

       LGPL2